Conveying device.



LS. DEWEY.

CONVEYING DEVICE.

APPLICATION FILED mmza, 1909.

. Patented June 14, 1910,

J sse 5e 45 @N1T STAT PATNT FFTQE.

JESSE S. DEWEY, OF EAST CHICAGO, INDIANA, ASSIGNOR TO GREEN ENGINEERING 00., OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

CONVEYING DEVICE.

eciaee.

To all whom it may concern:

Be it known that I, JEssE S. DEWEY, a citizen of the United States, and a resident of East Chicago, in the county of Lake and State of Indiana, have invented certain new and useful Improvements in Conveying Devices; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings and to the numerals of reference marked thereon, which form a part of this specification.

This invention relates to a conveying device of that kind having a plurality of bodily reciprocating and oscillating blades or scrapers, which act in connection with a flat supporting surface on which rests the mate rial to be moved.

A device embodying my invention is adapted for conveying or moving all kinds of granular material but is shown in the accompanying drawings as applied to a boiler furnace, in connection with an endless traveling grate, for the purpose of removing from beneath the grate particles of unburned coal which pass through the grate and fall upon a surface beneath the same.

The invention consists in the matters hereinafter set forth and more particularly pointed out in the appended claims.

In the accompanying drawings in which my invent-ion is shown in connection with a boiler furnace, Figure 1 is a view in central longitudinal section of a boiler furnace together with a conveying device embodying my invention. Fig. 2 is a view in transverse vertical section taken upon line 22 of Fig. 1. Fig. 3 is a fragmentary detail view in side elevation of one of the scraper blades and the means for operating the same. Figs. 4 and 5 are detail sectional views showing the pivotal connection between one of the scraper arms and one of the actuating bars by which the blades are operated.

As shown in said drawings, 5 (Fig. 1) designates an endless traveling chain grate forming part of a steam boiler furnace. Said endless traveling grate is supported by sprocket wheels 6, 6 mounted in a frame 7 which may be supported in the furnace in any desired or preferred manner.

12, 12 indicates the side walls and 13 the bottom wall or floor of the ash pit. Said bottom wall or floor is located at a considerable distance below the level of the furnace Specification of Letters Patent.

Application filed January 23, 1909.

Patented June 14:, 191% Serial No. 473,873.

room floor and is in its main part flat and horizontal or approximately so. Between the chain grate and the floor 13 of the ash pit is a horizontal partition 15 separating the forward part of the furnace chamber from the part of the ash pit below it and formingtherewith a wide longitudinal passage through which ashes discharged from the rear end of the grate are removed to the front of the furnace. As shown in the drawings, the said partition is made of concrete and has a fiat or horizontal top surface extending beneath the traveling grate and provided at its sides with sloping side walls 16, 16 adjacent to the supports of the conveying device hereinafter described. The said partition is supported by means of longitudinally arranged girders 14.,14 which rest upon the side walls 12, 12. The sloping side walls 16, 16 are inclined downwardly and inwardly in order to deflect toward the center of the partition particles of coal or ashes which fall from the grate. The said partition 15 terminates forward of the rear end of the grate, leaving at the rear of the furnace a space through which ashes and burned out fuel discharged at the rear end of the grate, may fall to the bottom of the ash pit. At the rear end of the said partition is located a damper wall 17 which rises from the partition and terminates near the level of the bottom of the chain grate. At its forward end the partition 15 terminates at a pit or depression 18 located beneath the forward end of the grate and preferably provided with an upwardly and forwardly inclined front wall 19 and an upwardly and backwardly inclined rear wall 20. The principal purpose of the partition 15 is to receive the particles of coal or unburned fuel which drop through or between the grate bars of the chain grate and to keep such unburned fuel separate from the ashes which are discharged from the rear end of the grate.

Now referring to the mechanism embodying my invention, which is employed for removing from the top surface of the partition 15 particles of unburned fuel falling thereon in the operation of the grate, the same is constructed as follows:

24;, 24 indicate a plurality of scraper plates or blades which are located above and operate in connection with the top surface of the partition 15, and which have both oscillatory and bodily reciprocating movement. Said scraper blades are hung upon or carried by a horizontally reciprocating supporting frame, which has movement in a direction from front to rear of the furnace and embraces two longitudinal frame bars 25, and transverse connecting rods 26, 26. Said connecting rods are arranged at equal distances apart and severally support the scraper blades, which are pivotally supported on said rods. The frame bars 25, 25 are arranged horizontally at opposite sides of the space beneath the chain grate. The said frame bars 25, 25 are rigidly secured together by means of the transverse rods 26, 26 which are secured at their ends in supporting lugs 27, 27 attached to the upper surfaces of the said bars. The said transverserods 26, 26 are secured in the said lugs 27, 27 by means of set screws 28,

28. The rigid frame formed by said frame members 25, 25 and the rods 26, 26 is adapted for endwise horizontal movement and may be supported in any manner permitting said movement. In the particular construction illustrated, the said frame is supported by means of two longitudinally arranged channel beams 30, 30 located one at each side of the partition 15. Said channel beams are placed with their webs upright and their flanges directed outwardly; the lower flanges thereof being embedded in the sloping side walls 16, 16, level with the top face of the partition wall 15. Said longitudinal channel beams 30, 30 are connected with each other by transverse channel beams 31, 32 located at the front and rear of the partition 15, the front beam 31 being located forward of the pit 18. The said frame bars 25, 25 rest and slide endwise upon the upper flanges of the channel beams 30, 30. The said frame bars 25, 25 have the form of angle bars, the horizontal parts of which rest on the top surfaces of the channel beams 30, 30 and the flanges 33, 33 of which ex tend downwardly outside of the outer margins of the said upper flanges of said beams. Said flanges 33, 33 thus arranged serve to prevent particles of unburned fuel or ashes working in between the bearing surfaces of the frame and the supporting beams 30, 30. The webs of said channel beams 30, 30 are provided at their lower margins with a plurality of equally spaced openings 35, 35 through which ashes which may enter the spaces outside of the said beams can pass from the sloping side walls 16, 16 to the top surface of the partition 15.

The scraper blades 24, 24 are arranged transversely of the frame bars 25, 25 and are pivotally suspended on the transverse rods 26, 26 in such manner that their lower margins are adapted to swing forwardly and rearwardly. Said scraper blades extend substantially the full width of the horizontal top surface of the partition wall, between .tached to the blades.

the inner faces of the beams 30, 30, and the lower margins of said blades are parallel with and adapted to act upon the fiat top surface of said partition wall. The rearmost of said scraper blades is so located that it is adapted to act upon the rear or inner end of said partition.

For supporting the scraper blades from the transverse rods 26, 26 each blade is provided at its upper margin with two supporting arms 41, 41 which are rigidly at The arms 41, 41 are apertured for the passage of said bars 26, 26, which latter form horizontal pivots on which the scraper blades swing. Said arms 41, 41 extend above the bars 26, 26 and are pivotally connected with two horizontal, longitudinally extending, endwise reciprocating actuating bars 43, 43, through the medium of which the scraper blades are given oscillatory movement on their pivots and are also given bodily reciprocating motion. In the construction illustrated, the supporting arm 41 is slotted at its upper end to re ceive the bar 43, to which it is connected by means of a pivot bolt 44 extending through the parts of the arm at opposite sides of the slot therein.

The several scraper blades have limited oscillatory or swinging movement on the pivot rods 26, 26, from a downwardly extending position, in which the lower margins of said blades are adapted to act upon the top surface of the partition 15, to a forwardly inclined position in which their lower margins are at a considerable distance above said top surface of the partition. Stops, arranged in any suitable manner, may be employed to limitthe oscillatory movement or swing of the several scraper blades. Such stops in the construction illustrated are formed by means of stop-shoulders 45, 46 formed on the arms 41, 41 beneath the actuating bars 43, 43, and adapted for contact with the lower margins of said bars. Said stop-shoulders are arranged. in such angular position that the forward stop-shoulder 45 will come in contact with said bar 43 and limit the upward swinging movement of the blades and the stop-shoulder 46 will come in contact with said bar and limit the downward or rearward swing of said blades.

Endwise reciprocatory motion may be given to the actuating bars 43, 43 by any suitable means operated by hand or by power. In the particular construction illustrated, a simple form of actuating means is employed consisting of a hand-lever 48 pivotally connected at its lower end with the partition 15 at a point forward andoutside of the furnace, the upper end of said lever being adapted to swing backwardly and forwardly in a vertical plane. Said lever 48 is connected with a horizontal reciprocating bar 43, 43 by means of connecting rods 49, 49. The parts are shown in Figs. 1 and 3 with the scraper blades in the position which they occupy when advancing or being drawn forward to carry the material on the partition 15 toward the front of the furnace. The stop-shoulders 46, 46 on the arms 41, 41 of the scraper blades are at this time (Fig. 4) in contact with the bars 43, 43, thereby preventing further backward swing of the blades and resulting in the supporting frame being carried or moved forward with the blades. At this time the lower margins of the blades are adjacent to or in contact with the top surface of the partition 15 and the blades are being drawn forward by the pull exerted on the actuating bars 43, 43 and the supporting frame is advancing with the scraper blades; the bars 25, 25 of said frame sliding on the beams 30, 30. Upon the completion of the forward movement of the scraper blades reverse or backward movement is given to the actuating bars 43, 43 and the first effect of such movement is to swing the upper ends of the several supporting arms 41, 41 backwardly or rearwardly on the pivot rods 26, until the stop-shoulders 45, 45 on said arms 41, 41 strike the lower edge of the bars 43, 43 (Fig. 5). By such rearward swinging movement of the upper ends of the arms 41, 41, the lower margins of the scraper blades are thrown forwardly and upwardly to the position shown in dotted lines in Fig. 3. As soon as the several scraper blades have reached the position described, further backward movement of the actuating bars 43, 43 results in the supporting frame and all of the scraper blades being moved bodily backward until the rearward limit of their movement is reached. At the beginning of the next forward stroke of said actuating bars 43, 43 the upper ends of said supporting arms 41, 41 will first be carried or swung forward until the stop-shoulders 46, 46 come in contact with said bars 43, 43, when the scraper blades will have been swung downwardly to their operative position, as shown in full lines in Fig. 3. Continuation of the forward movement of said actuating bars then has the effect of carrying the several scraper blades forwardly together with the supporting frame. The scraper blades, being in their depressed position when being carried forwardly or advanced, act to scrape or move along the surface beneath them the material thereon deposited. During the backward bodily movement of said scraper blades the lower edges of the same are swung forward and elevated and pass over the material resting upon said surface. The bodily backward and forward movement of the said scraper blades will, therefore, have the effect of scraping forward all of the material resting on sa1 terial carried forward by any one of the blades in the advance movement being caught and carried forward by the blade next in advance thereof in the subsequent advance movement of the latter, so that finally all of the material on the partition wall will be delivered to the forward end thereof and drop into the pit or depression 18.

From the above, it will be understood that, by the construction described, a positive os cillatory movement is given to the several scraper blades,'whereby the lower margins of the same will be swung upwardly and for wardly so as to pass over the material resting upon the supporting surface beneath them while they are making their backward strokes and said blades will be swung downwardly and held with their lower edges adjacent to or in contact with said supporting surface while making their forward strokes.

In the construction illustrated, the frictional resistance to endwise shifting movement of the supporting frame, due to the contact of the side bars 25, 25 with the sup porting beams 30, 30 on which they rest, insures the lifting movement of the scraper blades at the beginning of the backward movement of the actuating bars 43, 43 not withstanding the weight of the said scraper blades, which will tend to maintain them in their lowermost position. Any other means for producing frictional retardation of the movement of said supporting frame will, however, produce the same effect. Moreover, said supporting frame may be mounted or 1 0 supported in a manner to permit endwise reciprocatory movement thereof by means other than the supporting devices shown.

Although the conveying device described is shown in connection with a furnace hav- 105 ing an endless traveling chain grate, yet it is well adapted for use in connection with furnaces having grates of other types.

While the drawings show the device as having a plurality of the scraping blades, 11 yet my invention may be carried out in practice by a device having one scraping blade only, it being obvious that the same general result will be produced by the use of one as by a number of such scraper blades, and that 1 the amplitude of the bodily reciprocating movement given to the blade may be varied according to the length of the space through which the ashes or other material is to be conveyed or moved.

It will also be manifest that a device embracing the general features of construction hereinbefore described may be used for con veying pulverulent or granular material of any kind, such as coal or grain.

A conveying device embodying the general principles of construction hereinbefore set forth may be made in various forms and I do not, therefore, desire to be limited to the partition 15; the portion of ma- 1 particular features of construction and arrangement illustrated and described, except so far as the same may be pointed out in the appended claims as constituting parts of my invention.

I claim as my invention 1. A conveying device embracing a plurality of scraper blades, an endwise movable supporting frame having longitudinally arranged horizontal frame bars, two longitudinally arranged supporting members on which said longitudinal frame bars rest and with which they have frictional contact for retarding the movement of said frame bars, and a reciprocating actuating member, said blades being provided with supporting arms which have pivotal connection both with the supporting frame and actuating member, and said blades having limited oscillatory movement with respect to said supporting frame and actuating member.

2. A conveying device comprising a plurality of scraper blades provided with rigidly attached supporting arms, a supporting frame comprising longitudinal frame members and transverse rods rigidly connecting the same, two longitudinally arranged supporting members on which said longitudinal frame members rest and with which they have frictional contact to retard the movement of said supporting frame, and an end Wise reciprocating actuating bar, said supporting arms having pivotal connection with said transverse rods and with said actuating bar, and said blades having limited oscillatory movement with respect to said supporting frame and actuating bar.

3. A conveying device embracing a plurality of scraper blades, an endwise movable supporting frame having laterally arranged horizontal frame bars each consisting of a horizontal web and a depending flange, two longitudinally arranged supporting members on which said horizontal frame bars rest with theirflanges depending at the sides of the same, and a reciprocating actuating member, said blades being provided with supporting arms which have pivotal connection both with the support-ing frame and actuating member, and said blades having limited oscillatory movement with respect to said supporting frame and actuating member.

In testimony, that I claim the foregoing as my invention I affix my signature in the presence of two witnesses, this 18th day of January A. D. 1909. I

JESSE S. DEWEY. l/Vitnesses:

C. CLARENCE PooLE, GEORGE R. WILKINS. 

